Slow wireless connections (low throughput)

The throughput of the wireless connection (WiFi) established by a wireless device (such as a computer, smartphone, tablet) connected to the FRITZ!Box is lower than the throughput supported by the wireless standard. As a result, data is only transmitted very slowly, for example when downloading files from the Internet.

1 Checking which wireless standards the wireless device supports

Consult the corresponding manual or the manufacturer directly to find out which wireless standards the device supports and the maximum throughput it can establish wireless connections with.

2 Determining the user throughput of the wireless connection

The user throughput of the wireless standard being used determines the speed at which data is transmitted over wireless connections. The user throughput is significantly lower than the throughput given for wireless standards since a large part of it is required to establish and control the wireless connection.

Determine the user throughput for wireless connections according to the standard being used by your wireless device:

Wireless standard

Data streams / Channel bandwidth

Throughput up to

User throughput up to

802.11ac

4 / 80 MHz

1733 Mbit/s

860 Mbit/s

3 / 80 MHz

1300 Mbit/s

650 Mbit/s

2 / 80 MHz

866 Mbit/s

430 Mbit/s

1 / 80 MHz

433 Mbit/s

215 Mbit/s

4 / 40 MHz

800 Mbit/s

360 Mbit/s

3 / 40 MHz

600 Mbit/s

270 Mbit/s

2 / 40 MHz

400 Mbit/s

180 Mbit/s

1 / 40 MHz

200 Mbit/s

90 Mbit/s

4 / 20 MHz

350 Mbit/s

175 Mbit/s

3 / 20 MHz

260 Mbit/s

130 Mbit/s

2 / 20 MHz

173 Mbit/s

85 Mbit/s

1 / 20 MHz

86 Mbit/s

40 Mbit/s

802.11n

4 / 40 MHz

800 Mbit/s

400 Mbit/s

3 / 40 MHz

600 Mbit/s

300 Mbit/s

2 / 40 MHz

400 Mbit/s

200 Mbit/s

1 / 40 MHz

200 Mbit/s

100 Mbit/s

4 / 20 MHz

260 Mbit/s

120 Mbit/s

3 / 20 MHz

195 Mbit/s

90 Mbit/s

2 / 20 MHz

130 Mbit/s

60 Mbit/s

1 / 20 MHz

65 Mbit/s

30 Mbit/s

802.11g

-

54 Mbit/s

25 Mbit/s

802.11b

-

11 Mbit/s

5 Mbit/s

802.11a

-

54 Mbit/s

25 Mbit/s

Table: Throughput rates according to wireless standard

Important:In the case of wireless standards 802.11ac and 802.11n, the maximum throughput depends on the number of data streams and the channel bandwidth. In the factory settings, the FRITZ!Box uses radio channels that are 40 or 80 MHz wide.

If the data throughput of the wireless device is almost as high as the user throughput for the wireless connection, there is no problem.

3 Optimizing the wireless connection

Perform the following step if the throughput of the wireless device is significantly lower than the user throughput for the wireless connection:

Optimize the wireless connection as described in the following guide for the wireless standard you are using: